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TaxonomyBrowseInfoImagesLinksBooksData
Photo#1183594
Ephoron Leukon?  - Ephoron leukon

Ephoron Leukon? - Ephoron leukon
Coon Rapids Dam, Coon Rapids County, Minnesota, USA
July 21, 2015
Based off of the tusk key I found in this paper I narrowed it down to Ephoron.

http://www.ephemeroptera-galactica.com/pubs/pub_b/pubbaey1995p377.pdf

Looking further into species, leukon appears to be the only Ephoron species found in the MN area. Would this be a fair judgement to say it is leukon?

Images of this individual: tag all
Ephoron Leukon?  - White Fly - Ephoron leukon Ephoron Leukon?  - Ephoron leukon Ephoron Leukon?  - Ephoron leukon Ephoron Leukon?  - Ephoron leukon

Moved
Moved from Mayflies.

Ephoron album vs. Ephoron leukon
These species (in their nymphal lifestage) can be differentiated based on both the number of spines on their tusks, and whether or not their gills have trachea. Mayflies (The Angler And The Trout) by Fred L. Arbona Jr. indicates that Ephoron album have have 15-25 spines on each tusk, and to not have trachea in their gills, whereas Ephoron leukon have 28-39 spines on each tusk, and do have trachea in their gills.

Unfortunately, I do not feel qualified to make a species determination for you, but will observe that, although Ephoron album yet to be reported from MN, its species distribution is trans-continental, so it is reasonably likely to reside there as well. Hope this helps.

 
Gill Trachea
I uploaded an image of the gills. If, you would like to see them.

Thanks for the info :)

 
Gill trachea
Hi Lane-

Thanks for uploading the photo showing a blowup of the gills. The purple streaks on the gills are the treachea, so it appears that this nymph is Ephoron leukon as you originally suggested.

Moved
Moved from ID Request.

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